This episode's headline: Rebuilding Bosnia; On the Stump; Mailing It In; The Mystery of Vermeer; In Memoriam. ANCHOR: JIM LEHRER; GUESTS: UMAR AL-QADI, Mercy International; ROBERT DeVECCHI, International Rescue Committee; KENNETH HACKETT, Catholic Relief Services; STEVE FORBES, Republican Presidential Candidate; CZESLAW MILOSZ, Nobel Prize Winning Poet; ROBERT HASS, Poet Laureate; CORRESPONDENTS: CHARLAYNE HUNTER-GAULT; LEE HOCHBERG; PAUL SOLMAN;